[v7,06/10] pwm: dwc: split pci out of core driver
Commit Message
Moving towards adding non-pci support for the driver, move the pci
parts out of the core into their own module. This is partly due to
the module_driver() code only being allowed once in a module and also
to avoid a number of #ifdef if we build a single file in a system
without pci support.
Signed-off-by: Ben Dooks <ben.dooks@sifive.com>
---
v7:
- re-order kconfig to make dwc core be selected by PCI driver
v6:
- put DWC_PERIOD_NS back to avoid bisect issues
v4:
- removed DWC_PERIOD_NS as not needed
---
drivers/pwm/Kconfig | 17 +++-
drivers/pwm/Makefile | 1 +
drivers/pwm/pwm-dwc-pci.c | 133 ++++++++++++++++++++++++++++++++
drivers/pwm/pwm-dwc.c | 158 +-------------------------------------
drivers/pwm/pwm-dwc.h | 58 ++++++++++++++
5 files changed, 209 insertions(+), 158 deletions(-)
create mode 100644 drivers/pwm/pwm-dwc-pci.c
create mode 100644 drivers/pwm/pwm-dwc.h
Comments
Hello,
On Fri, Dec 23, 2022 at 03:38:16PM +0000, Ben Dooks wrote:
> Moving towards adding non-pci support for the driver, move the pci
> parts out of the core into their own module. This is partly due to
> the module_driver() code only being allowed once in a module and also
> to avoid a number of #ifdef if we build a single file in a system
> without pci support.
>
> Signed-off-by: Ben Dooks <ben.dooks@sifive.com>
> ---
> v7:
> - re-order kconfig to make dwc core be selected by PCI driver
> v6:
> - put DWC_PERIOD_NS back to avoid bisect issues
> v4:
> - removed DWC_PERIOD_NS as not needed
> ---
> drivers/pwm/Kconfig | 17 +++-
> drivers/pwm/Makefile | 1 +
> drivers/pwm/pwm-dwc-pci.c | 133 ++++++++++++++++++++++++++++++++
> drivers/pwm/pwm-dwc.c | 158 +-------------------------------------
> drivers/pwm/pwm-dwc.h | 58 ++++++++++++++
> 5 files changed, 209 insertions(+), 158 deletions(-)
> create mode 100644 drivers/pwm/pwm-dwc-pci.c
> create mode 100644 drivers/pwm/pwm-dwc.h
>
> diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
> index 3f3c53af4a56..8c5ef388a981 100644
> --- a/drivers/pwm/Kconfig
> +++ b/drivers/pwm/Kconfig
> @@ -174,16 +174,25 @@ config PWM_CROS_EC
> PWM driver for exposing a PWM attached to the ChromeOS Embedded
> Controller.
>
> -config PWM_DWC
> - tristate "DesignWare PWM Controller"
> - depends on PCI || COMPILE_TEST
You're loosing COMPILE_TEST here, as it's not present for the new
PWM_DWC.
> +config PWM_DWC_CORE
> + tristate
> depends on HAS_IOMEM
> help
> - PWM driver for Synopsys DWC PWM Controller attached to a PCI bus.
> + PWM driver for Synopsys DWC PWM Controller.
>
> To compile this driver as a module, choose M here: the module
> will be called pwm-dwc.
>
> +config PWM_DWC
> + tristate "DesignWare PWM Controller (PCI bus)"
> + depends on HAS_IOMEM && PCI
> + select PWM_DWC_CORE
> + help
> + PWM driver for Synopsys DWC PWM Controller attached to a PCI bus.
> +
> + To compile this driver as a module, choose M here: the module
> + will be called pwm-dwc-pci.
> +
> config PWM_EP93XX
> tristate "Cirrus Logic EP93xx PWM support"
> depends on ARCH_EP93XX || COMPILE_TEST
> diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
> index 7bf1a29f02b8..a70d36623129 100644
> --- a/drivers/pwm/Makefile
> +++ b/drivers/pwm/Makefile
> @@ -15,6 +15,7 @@ obj-$(CONFIG_PWM_CLPS711X) += pwm-clps711x.o
> obj-$(CONFIG_PWM_CRC) += pwm-crc.o
> obj-$(CONFIG_PWM_CROS_EC) += pwm-cros-ec.o
> obj-$(CONFIG_PWM_DWC) += pwm-dwc.o
> +obj-$(CONFIG_PWM_DWC_PCI) += pwm-dwc-pci.o
> obj-$(CONFIG_PWM_EP93XX) += pwm-ep93xx.o
> obj-$(CONFIG_PWM_FSL_FTM) += pwm-fsl-ftm.o
> obj-$(CONFIG_PWM_HIBVT) += pwm-hibvt.o
> diff --git a/drivers/pwm/pwm-dwc-pci.c b/drivers/pwm/pwm-dwc-pci.c
> new file mode 100644
> index 000000000000..2213d0e7f3c8
> --- /dev/null
> +++ b/drivers/pwm/pwm-dwc-pci.c
> @@ -0,0 +1,133 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * DesignWare PWM Controller driver (PCI part)
> + *
> + * Copyright (C) 2018-2020 Intel Corporation
> + *
> + * Author: Felipe Balbi (Intel)
> + * Author: Jarkko Nikula <jarkko.nikula@linux.intel.com>
> + * Author: Raymond Tan <raymond.tan@intel.com>
> + *
> + * Limitations:
> + * - The hardware cannot generate a 0 % or 100 % duty cycle. Both high and low
> + * periods are one or more input clock periods long.
> + */
> +
> +#include <linux/bitops.h>
> +#include <linux/export.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/pci.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/pwm.h>
> +
> +#include "pwm-dwc.h"
> +
> +static int dwc_pwm_probe(struct pci_dev *pci, const struct pci_device_id *id)
> +{
> + struct device *dev = &pci->dev;
> + struct dwc_pwm *dwc;
> + int ret;
> +
> + dwc = dwc_pwm_alloc(dev);
> + if (!dwc)
> + return -ENOMEM;
> +
> + ret = pcim_enable_device(pci);
> + if (ret) {
> + dev_err(dev, "Failed to enable device (%pe)\n", ERR_PTR(ret));
> + return ret;
> + }
> +
> + pci_set_master(pci);
> +
> + ret = pcim_iomap_regions(pci, BIT(0), pci_name(pci));
> + if (ret) {
> + dev_err(dev, "Failed to iomap PCI BAR (%pe)\n", ERR_PTR(ret));
> + return ret;
> + }
> +
> + dwc->base = pcim_iomap_table(pci)[0];
> + if (!dwc->base) {
> + dev_err(dev, "Base address missing\n");
> + return -ENOMEM;
> + }
> +
> + ret = devm_pwmchip_add(dev, &dwc->chip);
> + if (ret)
> + return ret;
> +
> + pm_runtime_put(dev);
> + pm_runtime_allow(dev);
> +
> + return 0;
> +}
> +
> +static void dwc_pwm_remove(struct pci_dev *pci)
> +{
> + pm_runtime_forbid(&pci->dev);
> + pm_runtime_get_noresume(&pci->dev);
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int dwc_pwm_suspend(struct device *dev)
> +{
> + struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
> + struct dwc_pwm *dwc = pci_get_drvdata(pdev);
> + int i;
> +
> + for (i = 0; i < DWC_TIMERS_TOTAL; i++) {
> + if (dwc->chip.pwms[i].state.enabled) {
> + dev_err(dev, "PWM %u in use by consumer (%s)\n",
> + i, dwc->chip.pwms[i].label);
> + return -EBUSY;
> + }
> + dwc->ctx[i].cnt = dwc_pwm_readl(dwc, DWC_TIM_LD_CNT(i));
> + dwc->ctx[i].cnt2 = dwc_pwm_readl(dwc, DWC_TIM_LD_CNT2(i));
> + dwc->ctx[i].ctrl = dwc_pwm_readl(dwc, DWC_TIM_CTRL(i));
> + }
> +
> + return 0;
> +}
> +
> +static int dwc_pwm_resume(struct device *dev)
> +{
> + struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
> + struct dwc_pwm *dwc = pci_get_drvdata(pdev);
> + int i;
> +
> + for (i = 0; i < DWC_TIMERS_TOTAL; i++) {
> + dwc_pwm_writel(dwc, dwc->ctx[i].cnt, DWC_TIM_LD_CNT(i));
> + dwc_pwm_writel(dwc, dwc->ctx[i].cnt2, DWC_TIM_LD_CNT2(i));
> + dwc_pwm_writel(dwc, dwc->ctx[i].ctrl, DWC_TIM_CTRL(i));
> + }
> +
> + return 0;
> +}
> +#endif
> +
> +static SIMPLE_DEV_PM_OPS(dwc_pwm_pm_ops, dwc_pwm_suspend, dwc_pwm_resume);
> +
> +static const struct pci_device_id dwc_pwm_id_table[] = {
> + { PCI_VDEVICE(INTEL, 0x4bb7) }, /* Elkhart Lake */
> + { } /* Terminating Entry */
> +};
> +MODULE_DEVICE_TABLE(pci, dwc_pwm_id_table);
> +
> +static struct pci_driver dwc_pwm_driver = {
> + .name = "pwm-dwc",
> + .probe = dwc_pwm_probe,
> + .remove = dwc_pwm_remove,
> + .id_table = dwc_pwm_id_table,
> + .driver = {
> + .pm = &dwc_pwm_pm_ops,
> + },
> +};
> +
> +module_pci_driver(dwc_pwm_driver);
> +
> +MODULE_AUTHOR("Felipe Balbi (Intel)");
> +MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@linux.intel.com>");
> +MODULE_AUTHOR("Raymond Tan <raymond.tan@intel.com>");
> +MODULE_DESCRIPTION("DesignWare PWM Controller");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/pwm/pwm-dwc.c b/drivers/pwm/pwm-dwc.c
> index 56cde9da2c0e..90a8ae1252a1 100644
> --- a/drivers/pwm/pwm-dwc.c
> +++ b/drivers/pwm/pwm-dwc.c
> @@ -1,16 +1,12 @@
> // SPDX-License-Identifier: GPL-2.0
> /*
> - * DesignWare PWM Controller driver
> + * DesignWare PWM Controller driver core
> *
> * Copyright (C) 2018-2020 Intel Corporation
> *
> * Author: Felipe Balbi (Intel)
> * Author: Jarkko Nikula <jarkko.nikula@linux.intel.com>
> * Author: Raymond Tan <raymond.tan@intel.com>
> - *
> - * Limitations:
> - * - The hardware cannot generate a 0 % or 100 % duty cycle. Both high and low
> - * periods are one or more input clock periods long.
> */
>
> #include <linux/bitops.h>
> @@ -21,51 +17,7 @@
> #include <linux/pm_runtime.h>
> #include <linux/pwm.h>
>
> -#define DWC_TIM_LD_CNT(n) ((n) * 0x14)
> -#define DWC_TIM_LD_CNT2(n) (((n) * 4) + 0xb0)
> -#define DWC_TIM_CUR_VAL(n) (((n) * 0x14) + 0x04)
> -#define DWC_TIM_CTRL(n) (((n) * 0x14) + 0x08)
> -#define DWC_TIM_EOI(n) (((n) * 0x14) + 0x0c)
> -#define DWC_TIM_INT_STS(n) (((n) * 0x14) + 0x10)
> -
> -#define DWC_TIMERS_INT_STS 0xa0
> -#define DWC_TIMERS_EOI 0xa4
> -#define DWC_TIMERS_RAW_INT_STS 0xa8
> -#define DWC_TIMERS_COMP_VERSION 0xac
> -
> -#define DWC_TIMERS_TOTAL 8
> -#define DWC_CLK_PERIOD_NS 10
> -
> -/* Timer Control Register */
> -#define DWC_TIM_CTRL_EN BIT(0)
> -#define DWC_TIM_CTRL_MODE BIT(1)
> -#define DWC_TIM_CTRL_MODE_FREE (0 << 1)
> -#define DWC_TIM_CTRL_MODE_USER (1 << 1)
> -#define DWC_TIM_CTRL_INT_MASK BIT(2)
> -#define DWC_TIM_CTRL_PWM BIT(3)
> -
> -struct dwc_pwm_ctx {
> - u32 cnt;
> - u32 cnt2;
> - u32 ctrl;
> -};
> -
> -struct dwc_pwm {
> - struct pwm_chip chip;
> - void __iomem *base;
> - struct dwc_pwm_ctx ctx[DWC_TIMERS_TOTAL];
> -};
> -#define to_dwc_pwm(p) (container_of((p), struct dwc_pwm, chip))
> -
> -static inline u32 dwc_pwm_readl(struct dwc_pwm *dwc, u32 offset)
> -{
> - return readl(dwc->base + offset);
> -}
> -
> -static inline void dwc_pwm_writel(struct dwc_pwm *dwc, u32 value, u32 offset)
> -{
> - writel(value, dwc->base + offset);
> -}
> +#include "pwm-dwc.h"
>
> static void __dwc_pwm_set_enable(struct dwc_pwm *dwc, int pwm, int enabled)
> {
> @@ -196,7 +148,7 @@ static const struct pwm_ops dwc_pwm_ops = {
> .owner = THIS_MODULE,
> };
>
> -static struct dwc_pwm *dwc_pwm_alloc(struct device *dev)
> +struct dwc_pwm *dwc_pwm_alloc(struct device *dev)
> {
> struct dwc_pwm *dwc;
>
> @@ -211,109 +163,7 @@ static struct dwc_pwm *dwc_pwm_alloc(struct device *dev)
> dev_set_drvdata(dev, dwc);
> return dwc;
> }
> -
> -static int dwc_pwm_probe(struct pci_dev *pci, const struct pci_device_id *id)
> -{
> - struct device *dev = &pci->dev;
> - struct dwc_pwm *dwc;
> - int ret;
> -
> - dwc = dwc_pwm_alloc(dev);
> - if (!dwc)
> - return -ENOMEM;
> -
> - ret = pcim_enable_device(pci);
> - if (ret) {
> - dev_err(dev, "Failed to enable device (%pe)\n", ERR_PTR(ret));
> - return ret;
> - }
> -
> - pci_set_master(pci);
> -
> - ret = pcim_iomap_regions(pci, BIT(0), pci_name(pci));
> - if (ret) {
> - dev_err(dev, "Failed to iomap PCI BAR (%pe)\n", ERR_PTR(ret));
> - return ret;
> - }
> -
> - dwc->base = pcim_iomap_table(pci)[0];
> - if (!dwc->base) {
> - dev_err(dev, "Base address missing\n");
> - return -ENOMEM;
> - }
> -
> - ret = devm_pwmchip_add(dev, &dwc->chip);
> - if (ret)
> - return ret;
> -
> - pm_runtime_put(dev);
> - pm_runtime_allow(dev);
> -
> - return 0;
> -}
> -
> -static void dwc_pwm_remove(struct pci_dev *pci)
> -{
> - pm_runtime_forbid(&pci->dev);
> - pm_runtime_get_noresume(&pci->dev);
> -}
> -
> -#ifdef CONFIG_PM_SLEEP
> -static int dwc_pwm_suspend(struct device *dev)
> -{
> - struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
> - struct dwc_pwm *dwc = pci_get_drvdata(pdev);
> - int i;
> -
> - for (i = 0; i < DWC_TIMERS_TOTAL; i++) {
> - if (dwc->chip.pwms[i].state.enabled) {
> - dev_err(dev, "PWM %u in use by consumer (%s)\n",
> - i, dwc->chip.pwms[i].label);
> - return -EBUSY;
> - }
> - dwc->ctx[i].cnt = dwc_pwm_readl(dwc, DWC_TIM_LD_CNT(i));
> - dwc->ctx[i].cnt2 = dwc_pwm_readl(dwc, DWC_TIM_LD_CNT2(i));
> - dwc->ctx[i].ctrl = dwc_pwm_readl(dwc, DWC_TIM_CTRL(i));
> - }
> -
> - return 0;
> -}
> -
> -static int dwc_pwm_resume(struct device *dev)
> -{
> - struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
> - struct dwc_pwm *dwc = pci_get_drvdata(pdev);
> - int i;
> -
> - for (i = 0; i < DWC_TIMERS_TOTAL; i++) {
> - dwc_pwm_writel(dwc, dwc->ctx[i].cnt, DWC_TIM_LD_CNT(i));
> - dwc_pwm_writel(dwc, dwc->ctx[i].cnt2, DWC_TIM_LD_CNT2(i));
> - dwc_pwm_writel(dwc, dwc->ctx[i].ctrl, DWC_TIM_CTRL(i));
> - }
> -
> - return 0;
> -}
> -#endif
> -
> -static SIMPLE_DEV_PM_OPS(dwc_pwm_pm_ops, dwc_pwm_suspend, dwc_pwm_resume);
> -
> -static const struct pci_device_id dwc_pwm_id_table[] = {
> - { PCI_VDEVICE(INTEL, 0x4bb7) }, /* Elkhart Lake */
> - { } /* Terminating Entry */
> -};
> -MODULE_DEVICE_TABLE(pci, dwc_pwm_id_table);
> -
> -static struct pci_driver dwc_pwm_driver = {
> - .name = "pwm-dwc",
> - .probe = dwc_pwm_probe,
> - .remove = dwc_pwm_remove,
> - .id_table = dwc_pwm_id_table,
> - .driver = {
> - .pm = &dwc_pwm_pm_ops,
> - },
> -};
> -
> -module_pci_driver(dwc_pwm_driver);
> +EXPORT_SYMBOL_GPL(dwc_pwm_alloc);
>
> MODULE_AUTHOR("Felipe Balbi (Intel)");
> MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@linux.intel.com>");
> diff --git a/drivers/pwm/pwm-dwc.h b/drivers/pwm/pwm-dwc.h
> new file mode 100644
> index 000000000000..68f98eb76152
> --- /dev/null
> +++ b/drivers/pwm/pwm-dwc.h
> @@ -0,0 +1,58 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * DesignWare PWM Controller driver
> + *
> + * Copyright (C) 2018-2020 Intel Corporation
> + *
> + * Author: Felipe Balbi (Intel)
> + * Author: Jarkko Nikula <jarkko.nikula@linux.intel.com>
> + * Author: Raymond Tan <raymond.tan@intel.com>
> + */
> +
> +#define DWC_TIM_LD_CNT(n) ((n) * 0x14)
> +#define DWC_TIM_LD_CNT2(n) (((n) * 4) + 0xb0)
> +#define DWC_TIM_CUR_VAL(n) (((n) * 0x14) + 0x04)
> +#define DWC_TIM_CTRL(n) (((n) * 0x14) + 0x08)
> +#define DWC_TIM_EOI(n) (((n) * 0x14) + 0x0c)
> +#define DWC_TIM_INT_STS(n) (((n) * 0x14) + 0x10)
> +
> +#define DWC_TIMERS_INT_STS 0xa0
> +#define DWC_TIMERS_EOI 0xa4
> +#define DWC_TIMERS_RAW_INT_STS 0xa8
> +#define DWC_TIMERS_COMP_VERSION 0xac
> +
> +#define DWC_TIMERS_TOTAL 8
> +#define DWC_CLK_PERIOD_NS 10
> +
> +/* Timer Control Register */
> +#define DWC_TIM_CTRL_EN BIT(0)
> +#define DWC_TIM_CTRL_MODE BIT(1)
> +#define DWC_TIM_CTRL_MODE_FREE (0 << 1)
> +#define DWC_TIM_CTRL_MODE_USER (1 << 1)
> +#define DWC_TIM_CTRL_INT_MASK BIT(2)
> +#define DWC_TIM_CTRL_PWM BIT(3)
> +
> +struct dwc_pwm_ctx {
> + u32 cnt;
> + u32 cnt2;
> + u32 ctrl;
> +};
> +
> +struct dwc_pwm {
> + struct pwm_chip chip;
> + void __iomem *base;
> + struct dwc_pwm_ctx ctx[DWC_TIMERS_TOTAL];
> +};
> +#define to_dwc_pwm(p) (container_of((p), struct dwc_pwm, chip))
> +
> +static inline u32 dwc_pwm_readl(struct dwc_pwm *dwc, u32 offset)
> +{
> + return readl(dwc->base + offset);
> +}
> +
> +static inline void dwc_pwm_writel(struct dwc_pwm *dwc, u32 value, u32 offset)
> +{
> + writel(value, dwc->base + offset);
> +}
> +
> +extern struct dwc_pwm *dwc_pwm_alloc(struct device *dev);
If you respin this patch for the COMPILE_TEST issue I pointed out above,
would you mind using a module namespace?
That would work by adding e.g.
#define DEFAULT_SYMBOL_NAMESPACE dwc-pwm
to drivers/pwm/pwm-dwc.c (before the includes) and
MODULE_IMPORT_NS(dwc-pwm)
to drivers/pwm/pwm-dwc.h.
Best regards
Uwe
On 16/02/2023 21:30, Uwe Kleine-König wrote:
> Hello,
>
> On Fri, Dec 23, 2022 at 03:38:16PM +0000, Ben Dooks wrote:
>> Moving towards adding non-pci support for the driver, move the pci
>> parts out of the core into their own module. This is partly due to
>> the module_driver() code only being allowed once in a module and also
>> to avoid a number of #ifdef if we build a single file in a system
>> without pci support.
>>
>> Signed-off-by: Ben Dooks <ben.dooks@sifive.com>
>> ---
>> v7:
>> - re-order kconfig to make dwc core be selected by PCI driver
>> v6:
>> - put DWC_PERIOD_NS back to avoid bisect issues
>> v4:
>> - removed DWC_PERIOD_NS as not needed
>> ---
>> drivers/pwm/Kconfig | 17 +++-
>> drivers/pwm/Makefile | 1 +
>> drivers/pwm/pwm-dwc-pci.c | 133 ++++++++++++++++++++++++++++++++
>> drivers/pwm/pwm-dwc.c | 158 +-------------------------------------
>> drivers/pwm/pwm-dwc.h | 58 ++++++++++++++
>> 5 files changed, 209 insertions(+), 158 deletions(-)
>> create mode 100644 drivers/pwm/pwm-dwc-pci.c
>> create mode 100644 drivers/pwm/pwm-dwc.h
>>
>> diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
>> index 3f3c53af4a56..8c5ef388a981 100644
>> --- a/drivers/pwm/Kconfig
>> +++ b/drivers/pwm/Kconfig
>> @@ -174,16 +174,25 @@ config PWM_CROS_EC
>> PWM driver for exposing a PWM attached to the ChromeOS Embedded
>> Controller.
>>
>> -config PWM_DWC
>> - tristate "DesignWare PWM Controller"
>> - depends on PCI || COMPILE_TEST
>
> You're loosing COMPILE_TEST here, as it's not present for the new
> PWM_DWC.
>
>> +config PWM_DWC_CORE
>> + tristate
>> depends on HAS_IOMEM
>> help
>> - PWM driver for Synopsys DWC PWM Controller attached to a PCI bus.
>> + PWM driver for Synopsys DWC PWM Controller.
>>
>> To compile this driver as a module, choose M here: the module
>> will be called pwm-dwc.
>>
>> +config PWM_DWC
>> + tristate "DesignWare PWM Controller (PCI bus)"
>> + depends on HAS_IOMEM && PCI
>> + select PWM_DWC_CORE
>> + help
>> + PWM driver for Synopsys DWC PWM Controller attached to a PCI bus.
>> +
>> + To compile this driver as a module, choose M here: the module
>> + will be called pwm-dwc-pci.
>> +
>> config PWM_EP93XX
>> tristate "Cirrus Logic EP93xx PWM support"
>> depends on ARCH_EP93XX || COMPILE_TEST
>> diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
>> index 7bf1a29f02b8..a70d36623129 100644
>> --- a/drivers/pwm/Makefile
>> +++ b/drivers/pwm/Makefile
>> @@ -15,6 +15,7 @@ obj-$(CONFIG_PWM_CLPS711X) += pwm-clps711x.o
>> obj-$(CONFIG_PWM_CRC) += pwm-crc.o
>> obj-$(CONFIG_PWM_CROS_EC) += pwm-cros-ec.o
>> obj-$(CONFIG_PWM_DWC) += pwm-dwc.o
>> +obj-$(CONFIG_PWM_DWC_PCI) += pwm-dwc-pci.o
>> obj-$(CONFIG_PWM_EP93XX) += pwm-ep93xx.o
>> obj-$(CONFIG_PWM_FSL_FTM) += pwm-fsl-ftm.o
>> obj-$(CONFIG_PWM_HIBVT) += pwm-hibvt.o
>> diff --git a/drivers/pwm/pwm-dwc-pci.c b/drivers/pwm/pwm-dwc-pci.c
>> new file mode 100644
>> index 000000000000..2213d0e7f3c8
>> --- /dev/null
>> +++ b/drivers/pwm/pwm-dwc-pci.c
>> @@ -0,0 +1,133 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * DesignWare PWM Controller driver (PCI part)
>> + *
>> + * Copyright (C) 2018-2020 Intel Corporation
>> + *
>> + * Author: Felipe Balbi (Intel)
>> + * Author: Jarkko Nikula <jarkko.nikula@linux.intel.com>
>> + * Author: Raymond Tan <raymond.tan@intel.com>
>> + *
>> + * Limitations:
>> + * - The hardware cannot generate a 0 % or 100 % duty cycle. Both high and low
>> + * periods are one or more input clock periods long.
>> + */
>> +
>> +#include <linux/bitops.h>
>> +#include <linux/export.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/pci.h>
>> +#include <linux/pm_runtime.h>
>> +#include <linux/pwm.h>
>> +
>> +#include "pwm-dwc.h"
>> +
>> +static int dwc_pwm_probe(struct pci_dev *pci, const struct pci_device_id *id)
>> +{
>> + struct device *dev = &pci->dev;
>> + struct dwc_pwm *dwc;
>> + int ret;
>> +
>> + dwc = dwc_pwm_alloc(dev);
>> + if (!dwc)
>> + return -ENOMEM;
>> +
>> + ret = pcim_enable_device(pci);
>> + if (ret) {
>> + dev_err(dev, "Failed to enable device (%pe)\n", ERR_PTR(ret));
>> + return ret;
>> + }
>> +
>> + pci_set_master(pci);
>> +
>> + ret = pcim_iomap_regions(pci, BIT(0), pci_name(pci));
>> + if (ret) {
>> + dev_err(dev, "Failed to iomap PCI BAR (%pe)\n", ERR_PTR(ret));
>> + return ret;
>> + }
>> +
>> + dwc->base = pcim_iomap_table(pci)[0];
>> + if (!dwc->base) {
>> + dev_err(dev, "Base address missing\n");
>> + return -ENOMEM;
>> + }
>> +
>> + ret = devm_pwmchip_add(dev, &dwc->chip);
>> + if (ret)
>> + return ret;
>> +
>> + pm_runtime_put(dev);
>> + pm_runtime_allow(dev);
>> +
>> + return 0;
>> +}
>> +
>> +static void dwc_pwm_remove(struct pci_dev *pci)
>> +{
>> + pm_runtime_forbid(&pci->dev);
>> + pm_runtime_get_noresume(&pci->dev);
>> +}
>> +
>> +#ifdef CONFIG_PM_SLEEP
>> +static int dwc_pwm_suspend(struct device *dev)
>> +{
>> + struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
>> + struct dwc_pwm *dwc = pci_get_drvdata(pdev);
>> + int i;
>> +
>> + for (i = 0; i < DWC_TIMERS_TOTAL; i++) {
>> + if (dwc->chip.pwms[i].state.enabled) {
>> + dev_err(dev, "PWM %u in use by consumer (%s)\n",
>> + i, dwc->chip.pwms[i].label);
>> + return -EBUSY;
>> + }
>> + dwc->ctx[i].cnt = dwc_pwm_readl(dwc, DWC_TIM_LD_CNT(i));
>> + dwc->ctx[i].cnt2 = dwc_pwm_readl(dwc, DWC_TIM_LD_CNT2(i));
>> + dwc->ctx[i].ctrl = dwc_pwm_readl(dwc, DWC_TIM_CTRL(i));
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int dwc_pwm_resume(struct device *dev)
>> +{
>> + struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
>> + struct dwc_pwm *dwc = pci_get_drvdata(pdev);
>> + int i;
>> +
>> + for (i = 0; i < DWC_TIMERS_TOTAL; i++) {
>> + dwc_pwm_writel(dwc, dwc->ctx[i].cnt, DWC_TIM_LD_CNT(i));
>> + dwc_pwm_writel(dwc, dwc->ctx[i].cnt2, DWC_TIM_LD_CNT2(i));
>> + dwc_pwm_writel(dwc, dwc->ctx[i].ctrl, DWC_TIM_CTRL(i));
>> + }
>> +
>> + return 0;
>> +}
>> +#endif
>> +
>> +static SIMPLE_DEV_PM_OPS(dwc_pwm_pm_ops, dwc_pwm_suspend, dwc_pwm_resume);
>> +
>> +static const struct pci_device_id dwc_pwm_id_table[] = {
>> + { PCI_VDEVICE(INTEL, 0x4bb7) }, /* Elkhart Lake */
>> + { } /* Terminating Entry */
>> +};
>> +MODULE_DEVICE_TABLE(pci, dwc_pwm_id_table);
>> +
>> +static struct pci_driver dwc_pwm_driver = {
>> + .name = "pwm-dwc",
>> + .probe = dwc_pwm_probe,
>> + .remove = dwc_pwm_remove,
>> + .id_table = dwc_pwm_id_table,
>> + .driver = {
>> + .pm = &dwc_pwm_pm_ops,
>> + },
>> +};
>> +
>> +module_pci_driver(dwc_pwm_driver);
>> +
>> +MODULE_AUTHOR("Felipe Balbi (Intel)");
>> +MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@linux.intel.com>");
>> +MODULE_AUTHOR("Raymond Tan <raymond.tan@intel.com>");
>> +MODULE_DESCRIPTION("DesignWare PWM Controller");
>> +MODULE_LICENSE("GPL");
>> diff --git a/drivers/pwm/pwm-dwc.c b/drivers/pwm/pwm-dwc.c
>> index 56cde9da2c0e..90a8ae1252a1 100644
>> --- a/drivers/pwm/pwm-dwc.c
>> +++ b/drivers/pwm/pwm-dwc.c
>> @@ -1,16 +1,12 @@
>> // SPDX-License-Identifier: GPL-2.0
>> /*
>> - * DesignWare PWM Controller driver
>> + * DesignWare PWM Controller driver core
>> *
>> * Copyright (C) 2018-2020 Intel Corporation
>> *
>> * Author: Felipe Balbi (Intel)
>> * Author: Jarkko Nikula <jarkko.nikula@linux.intel.com>
>> * Author: Raymond Tan <raymond.tan@intel.com>
>> - *
>> - * Limitations:
>> - * - The hardware cannot generate a 0 % or 100 % duty cycle. Both high and low
>> - * periods are one or more input clock periods long.
>> */
>>
>> #include <linux/bitops.h>
>> @@ -21,51 +17,7 @@
>> #include <linux/pm_runtime.h>
>> #include <linux/pwm.h>
>>
>> -#define DWC_TIM_LD_CNT(n) ((n) * 0x14)
>> -#define DWC_TIM_LD_CNT2(n) (((n) * 4) + 0xb0)
>> -#define DWC_TIM_CUR_VAL(n) (((n) * 0x14) + 0x04)
>> -#define DWC_TIM_CTRL(n) (((n) * 0x14) + 0x08)
>> -#define DWC_TIM_EOI(n) (((n) * 0x14) + 0x0c)
>> -#define DWC_TIM_INT_STS(n) (((n) * 0x14) + 0x10)
>> -
>> -#define DWC_TIMERS_INT_STS 0xa0
>> -#define DWC_TIMERS_EOI 0xa4
>> -#define DWC_TIMERS_RAW_INT_STS 0xa8
>> -#define DWC_TIMERS_COMP_VERSION 0xac
>> -
>> -#define DWC_TIMERS_TOTAL 8
>> -#define DWC_CLK_PERIOD_NS 10
>> -
>> -/* Timer Control Register */
>> -#define DWC_TIM_CTRL_EN BIT(0)
>> -#define DWC_TIM_CTRL_MODE BIT(1)
>> -#define DWC_TIM_CTRL_MODE_FREE (0 << 1)
>> -#define DWC_TIM_CTRL_MODE_USER (1 << 1)
>> -#define DWC_TIM_CTRL_INT_MASK BIT(2)
>> -#define DWC_TIM_CTRL_PWM BIT(3)
>> -
>> -struct dwc_pwm_ctx {
>> - u32 cnt;
>> - u32 cnt2;
>> - u32 ctrl;
>> -};
>> -
>> -struct dwc_pwm {
>> - struct pwm_chip chip;
>> - void __iomem *base;
>> - struct dwc_pwm_ctx ctx[DWC_TIMERS_TOTAL];
>> -};
>> -#define to_dwc_pwm(p) (container_of((p), struct dwc_pwm, chip))
>> -
>> -static inline u32 dwc_pwm_readl(struct dwc_pwm *dwc, u32 offset)
>> -{
>> - return readl(dwc->base + offset);
>> -}
>> -
>> -static inline void dwc_pwm_writel(struct dwc_pwm *dwc, u32 value, u32 offset)
>> -{
>> - writel(value, dwc->base + offset);
>> -}
>> +#include "pwm-dwc.h"
>>
>> static void __dwc_pwm_set_enable(struct dwc_pwm *dwc, int pwm, int enabled)
>> {
>> @@ -196,7 +148,7 @@ static const struct pwm_ops dwc_pwm_ops = {
>> .owner = THIS_MODULE,
>> };
>>
>> -static struct dwc_pwm *dwc_pwm_alloc(struct device *dev)
>> +struct dwc_pwm *dwc_pwm_alloc(struct device *dev)
>> {
>> struct dwc_pwm *dwc;
>>
>> @@ -211,109 +163,7 @@ static struct dwc_pwm *dwc_pwm_alloc(struct device *dev)
>> dev_set_drvdata(dev, dwc);
>> return dwc;
>> }
>> -
>> -static int dwc_pwm_probe(struct pci_dev *pci, const struct pci_device_id *id)
>> -{
>> - struct device *dev = &pci->dev;
>> - struct dwc_pwm *dwc;
>> - int ret;
>> -
>> - dwc = dwc_pwm_alloc(dev);
>> - if (!dwc)
>> - return -ENOMEM;
>> -
>> - ret = pcim_enable_device(pci);
>> - if (ret) {
>> - dev_err(dev, "Failed to enable device (%pe)\n", ERR_PTR(ret));
>> - return ret;
>> - }
>> -
>> - pci_set_master(pci);
>> -
>> - ret = pcim_iomap_regions(pci, BIT(0), pci_name(pci));
>> - if (ret) {
>> - dev_err(dev, "Failed to iomap PCI BAR (%pe)\n", ERR_PTR(ret));
>> - return ret;
>> - }
>> -
>> - dwc->base = pcim_iomap_table(pci)[0];
>> - if (!dwc->base) {
>> - dev_err(dev, "Base address missing\n");
>> - return -ENOMEM;
>> - }
>> -
>> - ret = devm_pwmchip_add(dev, &dwc->chip);
>> - if (ret)
>> - return ret;
>> -
>> - pm_runtime_put(dev);
>> - pm_runtime_allow(dev);
>> -
>> - return 0;
>> -}
>> -
>> -static void dwc_pwm_remove(struct pci_dev *pci)
>> -{
>> - pm_runtime_forbid(&pci->dev);
>> - pm_runtime_get_noresume(&pci->dev);
>> -}
>> -
>> -#ifdef CONFIG_PM_SLEEP
>> -static int dwc_pwm_suspend(struct device *dev)
>> -{
>> - struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
>> - struct dwc_pwm *dwc = pci_get_drvdata(pdev);
>> - int i;
>> -
>> - for (i = 0; i < DWC_TIMERS_TOTAL; i++) {
>> - if (dwc->chip.pwms[i].state.enabled) {
>> - dev_err(dev, "PWM %u in use by consumer (%s)\n",
>> - i, dwc->chip.pwms[i].label);
>> - return -EBUSY;
>> - }
>> - dwc->ctx[i].cnt = dwc_pwm_readl(dwc, DWC_TIM_LD_CNT(i));
>> - dwc->ctx[i].cnt2 = dwc_pwm_readl(dwc, DWC_TIM_LD_CNT2(i));
>> - dwc->ctx[i].ctrl = dwc_pwm_readl(dwc, DWC_TIM_CTRL(i));
>> - }
>> -
>> - return 0;
>> -}
>> -
>> -static int dwc_pwm_resume(struct device *dev)
>> -{
>> - struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
>> - struct dwc_pwm *dwc = pci_get_drvdata(pdev);
>> - int i;
>> -
>> - for (i = 0; i < DWC_TIMERS_TOTAL; i++) {
>> - dwc_pwm_writel(dwc, dwc->ctx[i].cnt, DWC_TIM_LD_CNT(i));
>> - dwc_pwm_writel(dwc, dwc->ctx[i].cnt2, DWC_TIM_LD_CNT2(i));
>> - dwc_pwm_writel(dwc, dwc->ctx[i].ctrl, DWC_TIM_CTRL(i));
>> - }
>> -
>> - return 0;
>> -}
>> -#endif
>> -
>> -static SIMPLE_DEV_PM_OPS(dwc_pwm_pm_ops, dwc_pwm_suspend, dwc_pwm_resume);
>> -
>> -static const struct pci_device_id dwc_pwm_id_table[] = {
>> - { PCI_VDEVICE(INTEL, 0x4bb7) }, /* Elkhart Lake */
>> - { } /* Terminating Entry */
>> -};
>> -MODULE_DEVICE_TABLE(pci, dwc_pwm_id_table);
>> -
>> -static struct pci_driver dwc_pwm_driver = {
>> - .name = "pwm-dwc",
>> - .probe = dwc_pwm_probe,
>> - .remove = dwc_pwm_remove,
>> - .id_table = dwc_pwm_id_table,
>> - .driver = {
>> - .pm = &dwc_pwm_pm_ops,
>> - },
>> -};
>> -
>> -module_pci_driver(dwc_pwm_driver);
>> +EXPORT_SYMBOL_GPL(dwc_pwm_alloc);
>>
>> MODULE_AUTHOR("Felipe Balbi (Intel)");
>> MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@linux.intel.com>");
>> diff --git a/drivers/pwm/pwm-dwc.h b/drivers/pwm/pwm-dwc.h
>> new file mode 100644
>> index 000000000000..68f98eb76152
>> --- /dev/null
>> +++ b/drivers/pwm/pwm-dwc.h
>> @@ -0,0 +1,58 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * DesignWare PWM Controller driver
>> + *
>> + * Copyright (C) 2018-2020 Intel Corporation
>> + *
>> + * Author: Felipe Balbi (Intel)
>> + * Author: Jarkko Nikula <jarkko.nikula@linux.intel.com>
>> + * Author: Raymond Tan <raymond.tan@intel.com>
>> + */
>> +
>> +#define DWC_TIM_LD_CNT(n) ((n) * 0x14)
>> +#define DWC_TIM_LD_CNT2(n) (((n) * 4) + 0xb0)
>> +#define DWC_TIM_CUR_VAL(n) (((n) * 0x14) + 0x04)
>> +#define DWC_TIM_CTRL(n) (((n) * 0x14) + 0x08)
>> +#define DWC_TIM_EOI(n) (((n) * 0x14) + 0x0c)
>> +#define DWC_TIM_INT_STS(n) (((n) * 0x14) + 0x10)
>> +
>> +#define DWC_TIMERS_INT_STS 0xa0
>> +#define DWC_TIMERS_EOI 0xa4
>> +#define DWC_TIMERS_RAW_INT_STS 0xa8
>> +#define DWC_TIMERS_COMP_VERSION 0xac
>> +
>> +#define DWC_TIMERS_TOTAL 8
>> +#define DWC_CLK_PERIOD_NS 10
>> +
>> +/* Timer Control Register */
>> +#define DWC_TIM_CTRL_EN BIT(0)
>> +#define DWC_TIM_CTRL_MODE BIT(1)
>> +#define DWC_TIM_CTRL_MODE_FREE (0 << 1)
>> +#define DWC_TIM_CTRL_MODE_USER (1 << 1)
>> +#define DWC_TIM_CTRL_INT_MASK BIT(2)
>> +#define DWC_TIM_CTRL_PWM BIT(3)
>> +
>> +struct dwc_pwm_ctx {
>> + u32 cnt;
>> + u32 cnt2;
>> + u32 ctrl;
>> +};
>> +
>> +struct dwc_pwm {
>> + struct pwm_chip chip;
>> + void __iomem *base;
>> + struct dwc_pwm_ctx ctx[DWC_TIMERS_TOTAL];
>> +};
>> +#define to_dwc_pwm(p) (container_of((p), struct dwc_pwm, chip))
>> +
>> +static inline u32 dwc_pwm_readl(struct dwc_pwm *dwc, u32 offset)
>> +{
>> + return readl(dwc->base + offset);
>> +}
>> +
>> +static inline void dwc_pwm_writel(struct dwc_pwm *dwc, u32 value, u32 offset)
>> +{
>> + writel(value, dwc->base + offset);
>> +}
>> +
>> +extern struct dwc_pwm *dwc_pwm_alloc(struct device *dev);
>
> If you respin this patch for the COMPILE_TEST issue I pointed out above,
> would you mind using a module namespace?
>
> That would work by adding e.g.
>
> #define DEFAULT_SYMBOL_NAMESPACE dwc-pwm
>
> to drivers/pwm/pwm-dwc.c (before the includes) and
>
> MODULE_IMPORT_NS(dwc-pwm)
>
> to drivers/pwm/pwm-dwc.h.
>
> Best regards
> Uwe
>
I tried adding these, but all I get is a bunch of compile errors.
On Tue, Jun 13, 2023 at 08:22:34PM +0100, Ben Dooks wrote:
> On 16/02/2023 21:30, Uwe Kleine-König wrote:
> > Hello,
> >
> > On Fri, Dec 23, 2022 at 03:38:16PM +0000, Ben Dooks wrote:
> > > Moving towards adding non-pci support for the driver, move the pci
> > > parts out of the core into their own module. This is partly due to
> > > the module_driver() code only being allowed once in a module and also
> > > to avoid a number of #ifdef if we build a single file in a system
> > > without pci support.
> > >
> > > Signed-off-by: Ben Dooks <ben.dooks@sifive.com>
> > > ---
> > > v7:
> > > - re-order kconfig to make dwc core be selected by PCI driver
> > > v6:
> > > - put DWC_PERIOD_NS back to avoid bisect issues
> > > v4:
> > > - removed DWC_PERIOD_NS as not needed
> > > ---
> > > drivers/pwm/Kconfig | 17 +++-
> > > drivers/pwm/Makefile | 1 +
> > > drivers/pwm/pwm-dwc-pci.c | 133 ++++++++++++++++++++++++++++++++
> > > drivers/pwm/pwm-dwc.c | 158 +-------------------------------------
> > > drivers/pwm/pwm-dwc.h | 58 ++++++++++++++
> > > 5 files changed, 209 insertions(+), 158 deletions(-)
> > > create mode 100644 drivers/pwm/pwm-dwc-pci.c
> > > create mode 100644 drivers/pwm/pwm-dwc.h
> > >
> > > diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
> > > index 3f3c53af4a56..8c5ef388a981 100644
> > > --- a/drivers/pwm/Kconfig
> > > +++ b/drivers/pwm/Kconfig
> > > @@ -174,16 +174,25 @@ config PWM_CROS_EC
> > > PWM driver for exposing a PWM attached to the ChromeOS Embedded
> > > Controller.
> > > -config PWM_DWC
> > > - tristate "DesignWare PWM Controller"
> > > - depends on PCI || COMPILE_TEST
> >
> > You're loosing COMPILE_TEST here, as it's not present for the new
> > PWM_DWC.
> >
> > > +config PWM_DWC_CORE
> > > + tristate
> > > depends on HAS_IOMEM
> > > help
> > > - PWM driver for Synopsys DWC PWM Controller attached to a PCI bus.
> > > + PWM driver for Synopsys DWC PWM Controller.
> > > To compile this driver as a module, choose M here: the module
> > > will be called pwm-dwc.
> > > +config PWM_DWC
> > > + tristate "DesignWare PWM Controller (PCI bus)"
> > > + depends on HAS_IOMEM && PCI
> > > + select PWM_DWC_CORE
> > > + help
> > > + PWM driver for Synopsys DWC PWM Controller attached to a PCI bus.
> > > +
> > > + To compile this driver as a module, choose M here: the module
> > > + will be called pwm-dwc-pci.
> > > +
> > > config PWM_EP93XX
> > > tristate "Cirrus Logic EP93xx PWM support"
> > > depends on ARCH_EP93XX || COMPILE_TEST
> > > diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
> > > index 7bf1a29f02b8..a70d36623129 100644
> > > --- a/drivers/pwm/Makefile
> > > +++ b/drivers/pwm/Makefile
> > > @@ -15,6 +15,7 @@ obj-$(CONFIG_PWM_CLPS711X) += pwm-clps711x.o
> > > obj-$(CONFIG_PWM_CRC) += pwm-crc.o
> > > obj-$(CONFIG_PWM_CROS_EC) += pwm-cros-ec.o
> > > obj-$(CONFIG_PWM_DWC) += pwm-dwc.o
> > > +obj-$(CONFIG_PWM_DWC_PCI) += pwm-dwc-pci.o
> > > obj-$(CONFIG_PWM_EP93XX) += pwm-ep93xx.o
> > > obj-$(CONFIG_PWM_FSL_FTM) += pwm-fsl-ftm.o
> > > obj-$(CONFIG_PWM_HIBVT) += pwm-hibvt.o
> > > diff --git a/drivers/pwm/pwm-dwc-pci.c b/drivers/pwm/pwm-dwc-pci.c
> > > new file mode 100644
> > > index 000000000000..2213d0e7f3c8
> > > --- /dev/null
> > > +++ b/drivers/pwm/pwm-dwc-pci.c
> > > @@ -0,0 +1,133 @@
> > > +// SPDX-License-Identifier: GPL-2.0
> > > +/*
> > > + * DesignWare PWM Controller driver (PCI part)
> > > + *
> > > + * Copyright (C) 2018-2020 Intel Corporation
> > > + *
> > > + * Author: Felipe Balbi (Intel)
> > > + * Author: Jarkko Nikula <jarkko.nikula@linux.intel.com>
> > > + * Author: Raymond Tan <raymond.tan@intel.com>
> > > + *
> > > + * Limitations:
> > > + * - The hardware cannot generate a 0 % or 100 % duty cycle. Both high and low
> > > + * periods are one or more input clock periods long.
> > > + */
> > > +
> > > +#include <linux/bitops.h>
> > > +#include <linux/export.h>
> > > +#include <linux/kernel.h>
> > > +#include <linux/module.h>
> > > +#include <linux/pci.h>
> > > +#include <linux/pm_runtime.h>
> > > +#include <linux/pwm.h>
> > > +
> > > +#include "pwm-dwc.h"
> > > +
> > > +static int dwc_pwm_probe(struct pci_dev *pci, const struct pci_device_id *id)
> > > +{
> > > + struct device *dev = &pci->dev;
> > > + struct dwc_pwm *dwc;
> > > + int ret;
> > > +
> > > + dwc = dwc_pwm_alloc(dev);
> > > + if (!dwc)
> > > + return -ENOMEM;
> > > +
> > > + ret = pcim_enable_device(pci);
> > > + if (ret) {
> > > + dev_err(dev, "Failed to enable device (%pe)\n", ERR_PTR(ret));
> > > + return ret;
> > > + }
> > > +
> > > + pci_set_master(pci);
> > > +
> > > + ret = pcim_iomap_regions(pci, BIT(0), pci_name(pci));
> > > + if (ret) {
> > > + dev_err(dev, "Failed to iomap PCI BAR (%pe)\n", ERR_PTR(ret));
> > > + return ret;
> > > + }
> > > +
> > > + dwc->base = pcim_iomap_table(pci)[0];
> > > + if (!dwc->base) {
> > > + dev_err(dev, "Base address missing\n");
> > > + return -ENOMEM;
> > > + }
> > > +
> > > + ret = devm_pwmchip_add(dev, &dwc->chip);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + pm_runtime_put(dev);
> > > + pm_runtime_allow(dev);
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static void dwc_pwm_remove(struct pci_dev *pci)
> > > +{
> > > + pm_runtime_forbid(&pci->dev);
> > > + pm_runtime_get_noresume(&pci->dev);
> > > +}
> > > +
> > > +#ifdef CONFIG_PM_SLEEP
> > > +static int dwc_pwm_suspend(struct device *dev)
> > > +{
> > > + struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
> > > + struct dwc_pwm *dwc = pci_get_drvdata(pdev);
> > > + int i;
> > > +
> > > + for (i = 0; i < DWC_TIMERS_TOTAL; i++) {
> > > + if (dwc->chip.pwms[i].state.enabled) {
> > > + dev_err(dev, "PWM %u in use by consumer (%s)\n",
> > > + i, dwc->chip.pwms[i].label);
> > > + return -EBUSY;
> > > + }
> > > + dwc->ctx[i].cnt = dwc_pwm_readl(dwc, DWC_TIM_LD_CNT(i));
> > > + dwc->ctx[i].cnt2 = dwc_pwm_readl(dwc, DWC_TIM_LD_CNT2(i));
> > > + dwc->ctx[i].ctrl = dwc_pwm_readl(dwc, DWC_TIM_CTRL(i));
> > > + }
> > > +
> > > + return 0;
> > > +}
> > > +
> > > +static int dwc_pwm_resume(struct device *dev)
> > > +{
> > > + struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
> > > + struct dwc_pwm *dwc = pci_get_drvdata(pdev);
> > > + int i;
> > > +
> > > + for (i = 0; i < DWC_TIMERS_TOTAL; i++) {
> > > + dwc_pwm_writel(dwc, dwc->ctx[i].cnt, DWC_TIM_LD_CNT(i));
> > > + dwc_pwm_writel(dwc, dwc->ctx[i].cnt2, DWC_TIM_LD_CNT2(i));
> > > + dwc_pwm_writel(dwc, dwc->ctx[i].ctrl, DWC_TIM_CTRL(i));
> > > + }
> > > +
> > > + return 0;
> > > +}
> > > +#endif
> > > +
> > > +static SIMPLE_DEV_PM_OPS(dwc_pwm_pm_ops, dwc_pwm_suspend, dwc_pwm_resume);
> > > +
> > > +static const struct pci_device_id dwc_pwm_id_table[] = {
> > > + { PCI_VDEVICE(INTEL, 0x4bb7) }, /* Elkhart Lake */
> > > + { } /* Terminating Entry */
> > > +};
> > > +MODULE_DEVICE_TABLE(pci, dwc_pwm_id_table);
> > > +
> > > +static struct pci_driver dwc_pwm_driver = {
> > > + .name = "pwm-dwc",
> > > + .probe = dwc_pwm_probe,
> > > + .remove = dwc_pwm_remove,
> > > + .id_table = dwc_pwm_id_table,
> > > + .driver = {
> > > + .pm = &dwc_pwm_pm_ops,
> > > + },
> > > +};
> > > +
> > > +module_pci_driver(dwc_pwm_driver);
> > > +
> > > +MODULE_AUTHOR("Felipe Balbi (Intel)");
> > > +MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@linux.intel.com>");
> > > +MODULE_AUTHOR("Raymond Tan <raymond.tan@intel.com>");
> > > +MODULE_DESCRIPTION("DesignWare PWM Controller");
> > > +MODULE_LICENSE("GPL");
> > > diff --git a/drivers/pwm/pwm-dwc.c b/drivers/pwm/pwm-dwc.c
> > > index 56cde9da2c0e..90a8ae1252a1 100644
> > > --- a/drivers/pwm/pwm-dwc.c
> > > +++ b/drivers/pwm/pwm-dwc.c
> > > @@ -1,16 +1,12 @@
> > > // SPDX-License-Identifier: GPL-2.0
> > > /*
> > > - * DesignWare PWM Controller driver
> > > + * DesignWare PWM Controller driver core
> > > *
> > > * Copyright (C) 2018-2020 Intel Corporation
> > > *
> > > * Author: Felipe Balbi (Intel)
> > > * Author: Jarkko Nikula <jarkko.nikula@linux.intel.com>
> > > * Author: Raymond Tan <raymond.tan@intel.com>
> > > - *
> > > - * Limitations:
> > > - * - The hardware cannot generate a 0 % or 100 % duty cycle. Both high and low
> > > - * periods are one or more input clock periods long.
> > > */
> > > #include <linux/bitops.h>
> > > @@ -21,51 +17,7 @@
> > > #include <linux/pm_runtime.h>
> > > #include <linux/pwm.h>
> > > -#define DWC_TIM_LD_CNT(n) ((n) * 0x14)
> > > -#define DWC_TIM_LD_CNT2(n) (((n) * 4) + 0xb0)
> > > -#define DWC_TIM_CUR_VAL(n) (((n) * 0x14) + 0x04)
> > > -#define DWC_TIM_CTRL(n) (((n) * 0x14) + 0x08)
> > > -#define DWC_TIM_EOI(n) (((n) * 0x14) + 0x0c)
> > > -#define DWC_TIM_INT_STS(n) (((n) * 0x14) + 0x10)
> > > -
> > > -#define DWC_TIMERS_INT_STS 0xa0
> > > -#define DWC_TIMERS_EOI 0xa4
> > > -#define DWC_TIMERS_RAW_INT_STS 0xa8
> > > -#define DWC_TIMERS_COMP_VERSION 0xac
> > > -
> > > -#define DWC_TIMERS_TOTAL 8
> > > -#define DWC_CLK_PERIOD_NS 10
> > > -
> > > -/* Timer Control Register */
> > > -#define DWC_TIM_CTRL_EN BIT(0)
> > > -#define DWC_TIM_CTRL_MODE BIT(1)
> > > -#define DWC_TIM_CTRL_MODE_FREE (0 << 1)
> > > -#define DWC_TIM_CTRL_MODE_USER (1 << 1)
> > > -#define DWC_TIM_CTRL_INT_MASK BIT(2)
> > > -#define DWC_TIM_CTRL_PWM BIT(3)
> > > -
> > > -struct dwc_pwm_ctx {
> > > - u32 cnt;
> > > - u32 cnt2;
> > > - u32 ctrl;
> > > -};
> > > -
> > > -struct dwc_pwm {
> > > - struct pwm_chip chip;
> > > - void __iomem *base;
> > > - struct dwc_pwm_ctx ctx[DWC_TIMERS_TOTAL];
> > > -};
> > > -#define to_dwc_pwm(p) (container_of((p), struct dwc_pwm, chip))
> > > -
> > > -static inline u32 dwc_pwm_readl(struct dwc_pwm *dwc, u32 offset)
> > > -{
> > > - return readl(dwc->base + offset);
> > > -}
> > > -
> > > -static inline void dwc_pwm_writel(struct dwc_pwm *dwc, u32 value, u32 offset)
> > > -{
> > > - writel(value, dwc->base + offset);
> > > -}
> > > +#include "pwm-dwc.h"
> > > static void __dwc_pwm_set_enable(struct dwc_pwm *dwc, int pwm, int enabled)
> > > {
> > > @@ -196,7 +148,7 @@ static const struct pwm_ops dwc_pwm_ops = {
> > > .owner = THIS_MODULE,
> > > };
> > > -static struct dwc_pwm *dwc_pwm_alloc(struct device *dev)
> > > +struct dwc_pwm *dwc_pwm_alloc(struct device *dev)
> > > {
> > > struct dwc_pwm *dwc;
> > > @@ -211,109 +163,7 @@ static struct dwc_pwm *dwc_pwm_alloc(struct device *dev)
> > > dev_set_drvdata(dev, dwc);
> > > return dwc;
> > > }
> > > -
> > > -static int dwc_pwm_probe(struct pci_dev *pci, const struct pci_device_id *id)
> > > -{
> > > - struct device *dev = &pci->dev;
> > > - struct dwc_pwm *dwc;
> > > - int ret;
> > > -
> > > - dwc = dwc_pwm_alloc(dev);
> > > - if (!dwc)
> > > - return -ENOMEM;
> > > -
> > > - ret = pcim_enable_device(pci);
> > > - if (ret) {
> > > - dev_err(dev, "Failed to enable device (%pe)\n", ERR_PTR(ret));
> > > - return ret;
> > > - }
> > > -
> > > - pci_set_master(pci);
> > > -
> > > - ret = pcim_iomap_regions(pci, BIT(0), pci_name(pci));
> > > - if (ret) {
> > > - dev_err(dev, "Failed to iomap PCI BAR (%pe)\n", ERR_PTR(ret));
> > > - return ret;
> > > - }
> > > -
> > > - dwc->base = pcim_iomap_table(pci)[0];
> > > - if (!dwc->base) {
> > > - dev_err(dev, "Base address missing\n");
> > > - return -ENOMEM;
> > > - }
> > > -
> > > - ret = devm_pwmchip_add(dev, &dwc->chip);
> > > - if (ret)
> > > - return ret;
> > > -
> > > - pm_runtime_put(dev);
> > > - pm_runtime_allow(dev);
> > > -
> > > - return 0;
> > > -}
> > > -
> > > -static void dwc_pwm_remove(struct pci_dev *pci)
> > > -{
> > > - pm_runtime_forbid(&pci->dev);
> > > - pm_runtime_get_noresume(&pci->dev);
> > > -}
> > > -
> > > -#ifdef CONFIG_PM_SLEEP
> > > -static int dwc_pwm_suspend(struct device *dev)
> > > -{
> > > - struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
> > > - struct dwc_pwm *dwc = pci_get_drvdata(pdev);
> > > - int i;
> > > -
> > > - for (i = 0; i < DWC_TIMERS_TOTAL; i++) {
> > > - if (dwc->chip.pwms[i].state.enabled) {
> > > - dev_err(dev, "PWM %u in use by consumer (%s)\n",
> > > - i, dwc->chip.pwms[i].label);
> > > - return -EBUSY;
> > > - }
> > > - dwc->ctx[i].cnt = dwc_pwm_readl(dwc, DWC_TIM_LD_CNT(i));
> > > - dwc->ctx[i].cnt2 = dwc_pwm_readl(dwc, DWC_TIM_LD_CNT2(i));
> > > - dwc->ctx[i].ctrl = dwc_pwm_readl(dwc, DWC_TIM_CTRL(i));
> > > - }
> > > -
> > > - return 0;
> > > -}
> > > -
> > > -static int dwc_pwm_resume(struct device *dev)
> > > -{
> > > - struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
> > > - struct dwc_pwm *dwc = pci_get_drvdata(pdev);
> > > - int i;
> > > -
> > > - for (i = 0; i < DWC_TIMERS_TOTAL; i++) {
> > > - dwc_pwm_writel(dwc, dwc->ctx[i].cnt, DWC_TIM_LD_CNT(i));
> > > - dwc_pwm_writel(dwc, dwc->ctx[i].cnt2, DWC_TIM_LD_CNT2(i));
> > > - dwc_pwm_writel(dwc, dwc->ctx[i].ctrl, DWC_TIM_CTRL(i));
> > > - }
> > > -
> > > - return 0;
> > > -}
> > > -#endif
> > > -
> > > -static SIMPLE_DEV_PM_OPS(dwc_pwm_pm_ops, dwc_pwm_suspend, dwc_pwm_resume);
> > > -
> > > -static const struct pci_device_id dwc_pwm_id_table[] = {
> > > - { PCI_VDEVICE(INTEL, 0x4bb7) }, /* Elkhart Lake */
> > > - { } /* Terminating Entry */
> > > -};
> > > -MODULE_DEVICE_TABLE(pci, dwc_pwm_id_table);
> > > -
> > > -static struct pci_driver dwc_pwm_driver = {
> > > - .name = "pwm-dwc",
> > > - .probe = dwc_pwm_probe,
> > > - .remove = dwc_pwm_remove,
> > > - .id_table = dwc_pwm_id_table,
> > > - .driver = {
> > > - .pm = &dwc_pwm_pm_ops,
> > > - },
> > > -};
> > > -
> > > -module_pci_driver(dwc_pwm_driver);
> > > +EXPORT_SYMBOL_GPL(dwc_pwm_alloc);
> > > MODULE_AUTHOR("Felipe Balbi (Intel)");
> > > MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@linux.intel.com>");
> > > diff --git a/drivers/pwm/pwm-dwc.h b/drivers/pwm/pwm-dwc.h
> > > new file mode 100644
> > > index 000000000000..68f98eb76152
> > > --- /dev/null
> > > +++ b/drivers/pwm/pwm-dwc.h
> > > @@ -0,0 +1,58 @@
> > > +// SPDX-License-Identifier: GPL-2.0
> > > +/*
> > > + * DesignWare PWM Controller driver
> > > + *
> > > + * Copyright (C) 2018-2020 Intel Corporation
> > > + *
> > > + * Author: Felipe Balbi (Intel)
> > > + * Author: Jarkko Nikula <jarkko.nikula@linux.intel.com>
> > > + * Author: Raymond Tan <raymond.tan@intel.com>
> > > + */
> > > +
> > > +#define DWC_TIM_LD_CNT(n) ((n) * 0x14)
> > > +#define DWC_TIM_LD_CNT2(n) (((n) * 4) + 0xb0)
> > > +#define DWC_TIM_CUR_VAL(n) (((n) * 0x14) + 0x04)
> > > +#define DWC_TIM_CTRL(n) (((n) * 0x14) + 0x08)
> > > +#define DWC_TIM_EOI(n) (((n) * 0x14) + 0x0c)
> > > +#define DWC_TIM_INT_STS(n) (((n) * 0x14) + 0x10)
> > > +
> > > +#define DWC_TIMERS_INT_STS 0xa0
> > > +#define DWC_TIMERS_EOI 0xa4
> > > +#define DWC_TIMERS_RAW_INT_STS 0xa8
> > > +#define DWC_TIMERS_COMP_VERSION 0xac
> > > +
> > > +#define DWC_TIMERS_TOTAL 8
> > > +#define DWC_CLK_PERIOD_NS 10
> > > +
> > > +/* Timer Control Register */
> > > +#define DWC_TIM_CTRL_EN BIT(0)
> > > +#define DWC_TIM_CTRL_MODE BIT(1)
> > > +#define DWC_TIM_CTRL_MODE_FREE (0 << 1)
> > > +#define DWC_TIM_CTRL_MODE_USER (1 << 1)
> > > +#define DWC_TIM_CTRL_INT_MASK BIT(2)
> > > +#define DWC_TIM_CTRL_PWM BIT(3)
> > > +
> > > +struct dwc_pwm_ctx {
> > > + u32 cnt;
> > > + u32 cnt2;
> > > + u32 ctrl;
> > > +};
> > > +
> > > +struct dwc_pwm {
> > > + struct pwm_chip chip;
> > > + void __iomem *base;
> > > + struct dwc_pwm_ctx ctx[DWC_TIMERS_TOTAL];
> > > +};
> > > +#define to_dwc_pwm(p) (container_of((p), struct dwc_pwm, chip))
> > > +
> > > +static inline u32 dwc_pwm_readl(struct dwc_pwm *dwc, u32 offset)
> > > +{
> > > + return readl(dwc->base + offset);
> > > +}
> > > +
> > > +static inline void dwc_pwm_writel(struct dwc_pwm *dwc, u32 value, u32 offset)
> > > +{
> > > + writel(value, dwc->base + offset);
> > > +}
> > > +
> > > +extern struct dwc_pwm *dwc_pwm_alloc(struct device *dev);
> >
> > If you respin this patch for the COMPILE_TEST issue I pointed out above,
> > would you mind using a module namespace?
> >
> > That would work by adding e.g.
> >
> > #define DEFAULT_SYMBOL_NAMESPACE dwc-pwm
> >
> > to drivers/pwm/pwm-dwc.c (before the includes) and
> >
> > MODULE_IMPORT_NS(dwc-pwm)
> >
> > to drivers/pwm/pwm-dwc.h.
> >
> > Best regards
> > Uwe
> >
>
> I tried adding these, but all I get is a bunch of compile errors.
I guess: Add a ; after MODULE_IMPORT_NS(dwc-pwm) fixes that?
To talk code:
https://git.pengutronix.de/cgit/ukl/linux/commit/?h=pwm-dwc-for-bjdooks&id=f3ebe7f1b46f57afee44d42cb8ab3835e8f662c9
works for me.
Best regards
Uwe
@@ -174,16 +174,25 @@ config PWM_CROS_EC
PWM driver for exposing a PWM attached to the ChromeOS Embedded
Controller.
-config PWM_DWC
- tristate "DesignWare PWM Controller"
- depends on PCI || COMPILE_TEST
+config PWM_DWC_CORE
+ tristate
depends on HAS_IOMEM
help
- PWM driver for Synopsys DWC PWM Controller attached to a PCI bus.
+ PWM driver for Synopsys DWC PWM Controller.
To compile this driver as a module, choose M here: the module
will be called pwm-dwc.
+config PWM_DWC
+ tristate "DesignWare PWM Controller (PCI bus)"
+ depends on HAS_IOMEM && PCI
+ select PWM_DWC_CORE
+ help
+ PWM driver for Synopsys DWC PWM Controller attached to a PCI bus.
+
+ To compile this driver as a module, choose M here: the module
+ will be called pwm-dwc-pci.
+
config PWM_EP93XX
tristate "Cirrus Logic EP93xx PWM support"
depends on ARCH_EP93XX || COMPILE_TEST
@@ -15,6 +15,7 @@ obj-$(CONFIG_PWM_CLPS711X) += pwm-clps711x.o
obj-$(CONFIG_PWM_CRC) += pwm-crc.o
obj-$(CONFIG_PWM_CROS_EC) += pwm-cros-ec.o
obj-$(CONFIG_PWM_DWC) += pwm-dwc.o
+obj-$(CONFIG_PWM_DWC_PCI) += pwm-dwc-pci.o
obj-$(CONFIG_PWM_EP93XX) += pwm-ep93xx.o
obj-$(CONFIG_PWM_FSL_FTM) += pwm-fsl-ftm.o
obj-$(CONFIG_PWM_HIBVT) += pwm-hibvt.o
new file mode 100644
@@ -0,0 +1,133 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * DesignWare PWM Controller driver (PCI part)
+ *
+ * Copyright (C) 2018-2020 Intel Corporation
+ *
+ * Author: Felipe Balbi (Intel)
+ * Author: Jarkko Nikula <jarkko.nikula@linux.intel.com>
+ * Author: Raymond Tan <raymond.tan@intel.com>
+ *
+ * Limitations:
+ * - The hardware cannot generate a 0 % or 100 % duty cycle. Both high and low
+ * periods are one or more input clock periods long.
+ */
+
+#include <linux/bitops.h>
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/pm_runtime.h>
+#include <linux/pwm.h>
+
+#include "pwm-dwc.h"
+
+static int dwc_pwm_probe(struct pci_dev *pci, const struct pci_device_id *id)
+{
+ struct device *dev = &pci->dev;
+ struct dwc_pwm *dwc;
+ int ret;
+
+ dwc = dwc_pwm_alloc(dev);
+ if (!dwc)
+ return -ENOMEM;
+
+ ret = pcim_enable_device(pci);
+ if (ret) {
+ dev_err(dev, "Failed to enable device (%pe)\n", ERR_PTR(ret));
+ return ret;
+ }
+
+ pci_set_master(pci);
+
+ ret = pcim_iomap_regions(pci, BIT(0), pci_name(pci));
+ if (ret) {
+ dev_err(dev, "Failed to iomap PCI BAR (%pe)\n", ERR_PTR(ret));
+ return ret;
+ }
+
+ dwc->base = pcim_iomap_table(pci)[0];
+ if (!dwc->base) {
+ dev_err(dev, "Base address missing\n");
+ return -ENOMEM;
+ }
+
+ ret = devm_pwmchip_add(dev, &dwc->chip);
+ if (ret)
+ return ret;
+
+ pm_runtime_put(dev);
+ pm_runtime_allow(dev);
+
+ return 0;
+}
+
+static void dwc_pwm_remove(struct pci_dev *pci)
+{
+ pm_runtime_forbid(&pci->dev);
+ pm_runtime_get_noresume(&pci->dev);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int dwc_pwm_suspend(struct device *dev)
+{
+ struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
+ struct dwc_pwm *dwc = pci_get_drvdata(pdev);
+ int i;
+
+ for (i = 0; i < DWC_TIMERS_TOTAL; i++) {
+ if (dwc->chip.pwms[i].state.enabled) {
+ dev_err(dev, "PWM %u in use by consumer (%s)\n",
+ i, dwc->chip.pwms[i].label);
+ return -EBUSY;
+ }
+ dwc->ctx[i].cnt = dwc_pwm_readl(dwc, DWC_TIM_LD_CNT(i));
+ dwc->ctx[i].cnt2 = dwc_pwm_readl(dwc, DWC_TIM_LD_CNT2(i));
+ dwc->ctx[i].ctrl = dwc_pwm_readl(dwc, DWC_TIM_CTRL(i));
+ }
+
+ return 0;
+}
+
+static int dwc_pwm_resume(struct device *dev)
+{
+ struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
+ struct dwc_pwm *dwc = pci_get_drvdata(pdev);
+ int i;
+
+ for (i = 0; i < DWC_TIMERS_TOTAL; i++) {
+ dwc_pwm_writel(dwc, dwc->ctx[i].cnt, DWC_TIM_LD_CNT(i));
+ dwc_pwm_writel(dwc, dwc->ctx[i].cnt2, DWC_TIM_LD_CNT2(i));
+ dwc_pwm_writel(dwc, dwc->ctx[i].ctrl, DWC_TIM_CTRL(i));
+ }
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(dwc_pwm_pm_ops, dwc_pwm_suspend, dwc_pwm_resume);
+
+static const struct pci_device_id dwc_pwm_id_table[] = {
+ { PCI_VDEVICE(INTEL, 0x4bb7) }, /* Elkhart Lake */
+ { } /* Terminating Entry */
+};
+MODULE_DEVICE_TABLE(pci, dwc_pwm_id_table);
+
+static struct pci_driver dwc_pwm_driver = {
+ .name = "pwm-dwc",
+ .probe = dwc_pwm_probe,
+ .remove = dwc_pwm_remove,
+ .id_table = dwc_pwm_id_table,
+ .driver = {
+ .pm = &dwc_pwm_pm_ops,
+ },
+};
+
+module_pci_driver(dwc_pwm_driver);
+
+MODULE_AUTHOR("Felipe Balbi (Intel)");
+MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@linux.intel.com>");
+MODULE_AUTHOR("Raymond Tan <raymond.tan@intel.com>");
+MODULE_DESCRIPTION("DesignWare PWM Controller");
+MODULE_LICENSE("GPL");
@@ -1,16 +1,12 @@
// SPDX-License-Identifier: GPL-2.0
/*
- * DesignWare PWM Controller driver
+ * DesignWare PWM Controller driver core
*
* Copyright (C) 2018-2020 Intel Corporation
*
* Author: Felipe Balbi (Intel)
* Author: Jarkko Nikula <jarkko.nikula@linux.intel.com>
* Author: Raymond Tan <raymond.tan@intel.com>
- *
- * Limitations:
- * - The hardware cannot generate a 0 % or 100 % duty cycle. Both high and low
- * periods are one or more input clock periods long.
*/
#include <linux/bitops.h>
@@ -21,51 +17,7 @@
#include <linux/pm_runtime.h>
#include <linux/pwm.h>
-#define DWC_TIM_LD_CNT(n) ((n) * 0x14)
-#define DWC_TIM_LD_CNT2(n) (((n) * 4) + 0xb0)
-#define DWC_TIM_CUR_VAL(n) (((n) * 0x14) + 0x04)
-#define DWC_TIM_CTRL(n) (((n) * 0x14) + 0x08)
-#define DWC_TIM_EOI(n) (((n) * 0x14) + 0x0c)
-#define DWC_TIM_INT_STS(n) (((n) * 0x14) + 0x10)
-
-#define DWC_TIMERS_INT_STS 0xa0
-#define DWC_TIMERS_EOI 0xa4
-#define DWC_TIMERS_RAW_INT_STS 0xa8
-#define DWC_TIMERS_COMP_VERSION 0xac
-
-#define DWC_TIMERS_TOTAL 8
-#define DWC_CLK_PERIOD_NS 10
-
-/* Timer Control Register */
-#define DWC_TIM_CTRL_EN BIT(0)
-#define DWC_TIM_CTRL_MODE BIT(1)
-#define DWC_TIM_CTRL_MODE_FREE (0 << 1)
-#define DWC_TIM_CTRL_MODE_USER (1 << 1)
-#define DWC_TIM_CTRL_INT_MASK BIT(2)
-#define DWC_TIM_CTRL_PWM BIT(3)
-
-struct dwc_pwm_ctx {
- u32 cnt;
- u32 cnt2;
- u32 ctrl;
-};
-
-struct dwc_pwm {
- struct pwm_chip chip;
- void __iomem *base;
- struct dwc_pwm_ctx ctx[DWC_TIMERS_TOTAL];
-};
-#define to_dwc_pwm(p) (container_of((p), struct dwc_pwm, chip))
-
-static inline u32 dwc_pwm_readl(struct dwc_pwm *dwc, u32 offset)
-{
- return readl(dwc->base + offset);
-}
-
-static inline void dwc_pwm_writel(struct dwc_pwm *dwc, u32 value, u32 offset)
-{
- writel(value, dwc->base + offset);
-}
+#include "pwm-dwc.h"
static void __dwc_pwm_set_enable(struct dwc_pwm *dwc, int pwm, int enabled)
{
@@ -196,7 +148,7 @@ static const struct pwm_ops dwc_pwm_ops = {
.owner = THIS_MODULE,
};
-static struct dwc_pwm *dwc_pwm_alloc(struct device *dev)
+struct dwc_pwm *dwc_pwm_alloc(struct device *dev)
{
struct dwc_pwm *dwc;
@@ -211,109 +163,7 @@ static struct dwc_pwm *dwc_pwm_alloc(struct device *dev)
dev_set_drvdata(dev, dwc);
return dwc;
}
-
-static int dwc_pwm_probe(struct pci_dev *pci, const struct pci_device_id *id)
-{
- struct device *dev = &pci->dev;
- struct dwc_pwm *dwc;
- int ret;
-
- dwc = dwc_pwm_alloc(dev);
- if (!dwc)
- return -ENOMEM;
-
- ret = pcim_enable_device(pci);
- if (ret) {
- dev_err(dev, "Failed to enable device (%pe)\n", ERR_PTR(ret));
- return ret;
- }
-
- pci_set_master(pci);
-
- ret = pcim_iomap_regions(pci, BIT(0), pci_name(pci));
- if (ret) {
- dev_err(dev, "Failed to iomap PCI BAR (%pe)\n", ERR_PTR(ret));
- return ret;
- }
-
- dwc->base = pcim_iomap_table(pci)[0];
- if (!dwc->base) {
- dev_err(dev, "Base address missing\n");
- return -ENOMEM;
- }
-
- ret = devm_pwmchip_add(dev, &dwc->chip);
- if (ret)
- return ret;
-
- pm_runtime_put(dev);
- pm_runtime_allow(dev);
-
- return 0;
-}
-
-static void dwc_pwm_remove(struct pci_dev *pci)
-{
- pm_runtime_forbid(&pci->dev);
- pm_runtime_get_noresume(&pci->dev);
-}
-
-#ifdef CONFIG_PM_SLEEP
-static int dwc_pwm_suspend(struct device *dev)
-{
- struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
- struct dwc_pwm *dwc = pci_get_drvdata(pdev);
- int i;
-
- for (i = 0; i < DWC_TIMERS_TOTAL; i++) {
- if (dwc->chip.pwms[i].state.enabled) {
- dev_err(dev, "PWM %u in use by consumer (%s)\n",
- i, dwc->chip.pwms[i].label);
- return -EBUSY;
- }
- dwc->ctx[i].cnt = dwc_pwm_readl(dwc, DWC_TIM_LD_CNT(i));
- dwc->ctx[i].cnt2 = dwc_pwm_readl(dwc, DWC_TIM_LD_CNT2(i));
- dwc->ctx[i].ctrl = dwc_pwm_readl(dwc, DWC_TIM_CTRL(i));
- }
-
- return 0;
-}
-
-static int dwc_pwm_resume(struct device *dev)
-{
- struct pci_dev *pdev = container_of(dev, struct pci_dev, dev);
- struct dwc_pwm *dwc = pci_get_drvdata(pdev);
- int i;
-
- for (i = 0; i < DWC_TIMERS_TOTAL; i++) {
- dwc_pwm_writel(dwc, dwc->ctx[i].cnt, DWC_TIM_LD_CNT(i));
- dwc_pwm_writel(dwc, dwc->ctx[i].cnt2, DWC_TIM_LD_CNT2(i));
- dwc_pwm_writel(dwc, dwc->ctx[i].ctrl, DWC_TIM_CTRL(i));
- }
-
- return 0;
-}
-#endif
-
-static SIMPLE_DEV_PM_OPS(dwc_pwm_pm_ops, dwc_pwm_suspend, dwc_pwm_resume);
-
-static const struct pci_device_id dwc_pwm_id_table[] = {
- { PCI_VDEVICE(INTEL, 0x4bb7) }, /* Elkhart Lake */
- { } /* Terminating Entry */
-};
-MODULE_DEVICE_TABLE(pci, dwc_pwm_id_table);
-
-static struct pci_driver dwc_pwm_driver = {
- .name = "pwm-dwc",
- .probe = dwc_pwm_probe,
- .remove = dwc_pwm_remove,
- .id_table = dwc_pwm_id_table,
- .driver = {
- .pm = &dwc_pwm_pm_ops,
- },
-};
-
-module_pci_driver(dwc_pwm_driver);
+EXPORT_SYMBOL_GPL(dwc_pwm_alloc);
MODULE_AUTHOR("Felipe Balbi (Intel)");
MODULE_AUTHOR("Jarkko Nikula <jarkko.nikula@linux.intel.com>");
new file mode 100644
@@ -0,0 +1,58 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * DesignWare PWM Controller driver
+ *
+ * Copyright (C) 2018-2020 Intel Corporation
+ *
+ * Author: Felipe Balbi (Intel)
+ * Author: Jarkko Nikula <jarkko.nikula@linux.intel.com>
+ * Author: Raymond Tan <raymond.tan@intel.com>
+ */
+
+#define DWC_TIM_LD_CNT(n) ((n) * 0x14)
+#define DWC_TIM_LD_CNT2(n) (((n) * 4) + 0xb0)
+#define DWC_TIM_CUR_VAL(n) (((n) * 0x14) + 0x04)
+#define DWC_TIM_CTRL(n) (((n) * 0x14) + 0x08)
+#define DWC_TIM_EOI(n) (((n) * 0x14) + 0x0c)
+#define DWC_TIM_INT_STS(n) (((n) * 0x14) + 0x10)
+
+#define DWC_TIMERS_INT_STS 0xa0
+#define DWC_TIMERS_EOI 0xa4
+#define DWC_TIMERS_RAW_INT_STS 0xa8
+#define DWC_TIMERS_COMP_VERSION 0xac
+
+#define DWC_TIMERS_TOTAL 8
+#define DWC_CLK_PERIOD_NS 10
+
+/* Timer Control Register */
+#define DWC_TIM_CTRL_EN BIT(0)
+#define DWC_TIM_CTRL_MODE BIT(1)
+#define DWC_TIM_CTRL_MODE_FREE (0 << 1)
+#define DWC_TIM_CTRL_MODE_USER (1 << 1)
+#define DWC_TIM_CTRL_INT_MASK BIT(2)
+#define DWC_TIM_CTRL_PWM BIT(3)
+
+struct dwc_pwm_ctx {
+ u32 cnt;
+ u32 cnt2;
+ u32 ctrl;
+};
+
+struct dwc_pwm {
+ struct pwm_chip chip;
+ void __iomem *base;
+ struct dwc_pwm_ctx ctx[DWC_TIMERS_TOTAL];
+};
+#define to_dwc_pwm(p) (container_of((p), struct dwc_pwm, chip))
+
+static inline u32 dwc_pwm_readl(struct dwc_pwm *dwc, u32 offset)
+{
+ return readl(dwc->base + offset);
+}
+
+static inline void dwc_pwm_writel(struct dwc_pwm *dwc, u32 value, u32 offset)
+{
+ writel(value, dwc->base + offset);
+}
+
+extern struct dwc_pwm *dwc_pwm_alloc(struct device *dev);